Abstract
Virtual fracture tests combining analytical considerations and a finite element analysis is performed to provide assessment of face sheet-to-core interface strength in sandwich panels. Three fracture test methods, different in laboratory testing procedures and virtual modeling solutions, such as sandwich double cantilever beams subjected to uneven bending moments (DCB-UBM), sandwich double cantilever beam (DCB) and sandwich single cantilever beam (SCB) specimens are examined with the aim to predict the fracture parameters—energy-release rate (ERR) and stress-intensity factors (SIFs)—required for the assessment of the interface strength within the framework of linear elastic fracture mechanics (LEFM). The existence of mode mixity at the bi-material interface of a sandwich panel is considered and appropriate methods applied for mode decomposition are described. The numerical analyses are carried out using the capabilities of the ABAQUS code. In general, good agreement between the results of numerically calculated fracture parameters and those obtained using analytical solutions and/or from experimental data available in the literature is observed. Finally, computational aspects of the numerical models have been revisited and put into perspective of the accurate and efficient interface strength assessments of sandwich panels.
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Acknowledgements
The first author would like to mention that this research has been conducted during his stay at the Institute of Mechanics of Otto-von-Guericke-Universitat Magdeburg, which was supported by the German Academic Exchange Service (DAAD) Funding Programme ID No. 57440915.
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Burlayenko, V.N., Altenbach, H., Dimitrova, S.D. (2020). Interface Strength Assessments of Sandwich Panels with a Face Sheet/Core Debond. In: Altenbach, H., Chinchaladze, N., Kienzler, R., Müller, W. (eds) Analysis of Shells, Plates, and Beams. Advanced Structured Materials, vol 134. Springer, Cham. https://doi.org/10.1007/978-3-030-47491-1_6
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